Description
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CT images of a nest-gallery system in Sugi timber. (a) A close up view of “kick-out holes”,
i.e., holes to dispose pellets from the nest-gallery; (b) a 2D cross-sectional image; (c) a 2D radial image,
indicating that the nest-gallery was extensively excavated all over the timber along the sapwood part,
parallel to the longitudinal axis of the timber; and (d) a 2D tangential image of the sapwood. In 2D CT
images, the gray value of a pixel corresponds to an index of density: the lighter the color, the denser
the area. Springwood and summerwood are indicated by darker and lighter colors in the images,
respectively. The arrow axis represents the longitudinal (L), radial (R), and tangential (T) directions of
the timber. S, sapwood; H, heartwood; P, fecal pellets. |